#include <stdio.h>   
  
#define ll long long   
  
int A, N;   
  
void euclid(ll &x, ll &y, int a, int b)     
{     
     if (b==0)     
         x = 1, y = 0;     
     else     
     {                
         euclid(x,y,b,a%b);   
         ll aux=x;   
         x=y;   
         y=aux-y*(a/b);   
     }   
}   
  
int main()   
{   
    ll nr=0,nrr;   
    freopen("inversmodular.in","r",stdin);   
    freopen("inversmodular.out","w",stdout);   
    scanf("%d %d",&A,&N);   
    euclid(nr,nrr,A,N);   
    if (nr<=0)   
       nr=N+nr%N;   
    printf("%lld",nr);   
return 0;   
}